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Magnetohydrodynamic hybrid simulation of Alfvén eigenmodes in Heliotron J, a low shear helical axis stellarator/heliotron
https://repo.qst.go.jp/records/80597
https://repo.qst.go.jp/records/805977b4fe8f2-a29e-4e33-8ac2-cd5738dae297
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-09-30 | |||||
| タイトル | ||||||
| タイトル | Magnetohydrodynamic hybrid simulation of Alfvén eigenmodes in Heliotron J, a low shear helical axis stellarator/heliotron | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Adulsiriswad, P.
× Adulsiriswad, P.× Todo, Y.× Yamamoto, Satoshi× Kado, S.× Kobayashi, S.× Ohshima, S.× Okada, H.× Minami, T.× Nakamura, Y.× Ishizawa, A.× Konoshima, S.× Mizuuchi, T.× Nagasaki, K.× Satoshi, Yamamoto |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Alfvén eigenmodes destabilized by energetic particles in Heliotron J, a low magnetic shear helical axis stellarator/heliotron with four toroidal equilibrium field periods, are investigated with MEGA, a hybrid simulation code for energetic particles interacting with a magnetohydrodynamic fluid. The objectives of this study are to validate the MEGA simulation results on Alfvén eigenmodes in Heliotron J, and to clarify the properties of Alfvén eigenmodes. The experimentally observed $n/m = 2/4$ global Alfvén eigenmode (GAE) was reproduced with MEGA simulations based on the experimental bulk plasma temperature and density profiles. Beside $n/m = 2/4$ GAE, $n/m = 1/2$ GAE was also observed with lower amplitude and linear growth rate. The frequency and spatial location of $n/m = 1/2$ GAE are close to those of the experimentally observed $n/m = 1/2$ energetic particle mode (EPM). For $n/m = 2/4$ GAE, it was found that the three-dimensional spatial profile of the GAE was primarily composed of n = 2 harmonics while the contribution from the other toroidal mode numbers such as n = 2 ± iNfp was weak, where 'i' and 'Nfp ' are arbitrary integer and toroidal field period, respectively. This indicates that the coupling of harmonics with the same toroidal mode number through toroidicity is dominant for the GAE spatial profile, and the coupling with the different toroidal mode numbers through helicity and bumpiness has minor effects. For $n/m = 1/2$ GAE, the coupling of harmonic through toroidicity is weaker than that of $n/m = 2/4$ GAE. The non-linear evolutions of the $n/m = 2/4$ GAE and $n/m = 1/2$ GAE destabilized by energetic particles with a bump-on-tail distribution and a slowing-down distribution were compared. Weak dependence of the linear growth rate for both $n/m = 2/4$ and $n/m = 1/2$ modes on charge-exchange time were implied. | |||||
| 書誌情報 |
Nuclear Fusion 巻 60, 号 9, p. 096005, 発行日 2020-09 |
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| 出版者 | ||||||
| 出版者 | IOP Publishing | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0029-5515 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1741-4326/ab9c4b | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://iopscience.iop.org/article/10.1088/1741-4326/ab9c4b | |||||
